Fuel pump



Dw 3 30 K. J. WATTERS 1,787,346

FUEL PUMP Filed March 25, 1929 Inventor A tiorney Patented Dec. 30, 1930 UNITED STATES PATENT OFFICE KENNETH J. WATTERS, F OCHEYEDEN, IOWA FUEL PUMP 7 Application filed Mar-ch 25, 1929. Serial No. 349,881.

This invention relates to a fuel pump which is especially designed for use in connection with what is commonly referred to in the trade as a McCormiclcDeering one and one-half horse power pump engine.

Having experienced difliculty in maintaining a constant feed of the fuel from the tank to the carburetor of an engine of this type, I have conceived certain refinements and improvements in the pump structure to render it more successful, dependable and efiicient in operation.

The existing pump structure for an engine of this class comprises a casting, a fuel inlet or intake from the supply tank, a check valve outlet leading to the carburetor and a simple suction and force feed pump.

I have improved the arrangement by embodying in the casting a valved chamber between the fuel intake and the carburetor outlet, the pump plunger extending into this chamber and cooperating withthe valve to prevent'the fuel from being forced back into the feed line and instead forced out through the carburetor passage, whereby to render the operation more positive and efficient.

The particular arrangement for accomplishing this improved result will become more readily apparent from the following description and drawings.

. In the drawings:

' Figure 1 is a fragmentary elevational and sectional view showing the complete arrangement.

Figure 2 is an enlarged detail showing the improved ball check valve chamber.

In the drawings the casing or body is generally designated by the reference character 8 and is of usual configuration and has an attaching flange 4 provided with the usual bolt holes 5. The numeral 6 represents the fuel feed or intake which leads from the supply tank (not shown) and 7 designates the offset part vof the casing which is bored to provide a passage 8 for the fuel to the carburetor (not shown). As is usual a ball check valve 9 is arranged in this passage and held against this seat by an expansion coiled spring 10. The pump plunger is designated by the reference character 11, and as usual extends through a stuffing box or fitting 12 where it is providedon its upper end with an operating head 13 with which the customary fork (not shown) is cooperable. There is a conventional spring 14 provided here for maintaining the plunger in the normal position shown in Figure 1.

The improvement consists in forming an elongated chamber in the casting as at 15 and this affords communication between the passages 6 and 8. The lower end of the plunger 11 extends into this chamber and the lower end of the chamber is formed into a valve seat as at 16 to accommodate a ball check valve 17.

I'Vith this arrangement it will be seen that when the plunger moves upwardly the fuel will be sucked into the chamber 15 through the feed line 6 of the tank. It will accumulate in this chamber. On the down stroke of the plunger the valve 17 will become seated and prevent back flow of the fuel into the line 6. Instead the fuel will be forced out from the chamber and up through the passage 8 to the carburetor. Hence as before stated this operation will render the structure more efficient and positive in action and will convert a heretofore inefficient device into one which is susceptible of fulfilling the requirements of a device of this class in a highly satisfactory and reliable manner.

The simplicity is such as to make it unnecessary to enter into a more detailed description.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent is Means in a pump engine for maintaining a constant feed of the fuel from the fuel supply tank to the carbureter of the engine, comprising a casting having an attaching flange for connection with the engine block and having a body portion bored to provide relatively angularly disposed internal passages converging toward a common point and forming a fuel intake from the supply tank, fuel outlet to the carburetor and plunger-receiving bore respectively, an elongated fuel collecting chamber connecting the converging ends of the passages and affording communication therebetween, a reciprocable plunger trod operably positioned Within the said plunger receiving bore- With'its lower end extending in the said fuel outlet passagefor into the said chamber, a ball check valve Within the chamber and -controlling communication between the latter and the fuel intake passage, said valve being operable to open the passage upon the intake stroke of the plunger and to close the same upon the exhaust stroke, and a spring tensionecl ball check valve With.-

oommunica-tion between the latter and the said elongated chamber, said spring tensioned valve being operable to closethe passage upon the intake strokeof the plunger and to open same upon the exhaust stroke of the'latte'r.

In testimony whereof I affix my signature.

" KENNETH WATTERs;

controlling 

